mb256 mounted hydraulic breaker

© 2015 STANLEY Black & Decker, Inc.New Britain, CT 06053

U.S.A.30341 10/2018 Ver. 41

USER MANUAL Safety, Operation and Maintenance

MB256MOUNTED

HYDRAULIC BREAKER

2 ► MB256 User Manual

DECLARATION OF CONFORMITYÜBEREINSTIMMUNGS-ERKLARUNGDECLARATION DE CONFORMITE CEE DECLARACION DE CONFORMIDADDICHIARAZIONE DI CONFORMITA

Hydraulic Tools

______________________________________________________________________I, the undersigned:Ich, der Unterzeichnende:Je soussigné:El abajo firmante:lo sottoscritto:

Weisbeck, Andy Surname and First names/Familiennname und Vornamen/Nom et prénom/Nombre y apellido/Cognome e nome

hereby declare that the equipment specified hereunder:bestätige hiermit, daß erklaren Produkt genannten Werk oder Gerät:déclare que l’équipement visé ci-dessous:Por la presente declaro que el equipo se especifica a continuación:Dichiaro che le apparecchiature specificate di seguito:

1. Category: Hydraulic Hammer BreakerKategorie:Catégorie:Categoria:Categoria:

2. Make/Marke/Marque/Marca/Marca Stanley3. Type/Typ/Type/Tipo/Tipo: MB256, MB256164. Serial number of equipment:

Seriennummer des Geräts:Numéro de série de l’équipement:Numero de serie del equipo:Matricola dell´attrezzatura:

All

5. Mass/Masse/Masse/Masa/Massa 493 lbs / 224 kg

Has been manufactured in conformity with Wurde hergestellt in Übereinstimmung mit Est fabriqué conformément Ha sido fabricado de acuerdo conE’ stata costruita in conformitá con

Directive/StandardsRichtlinie/StandardsDirectives/NormesDirectriz/Los NormasDirettiva/Norme

No.NrNuméroNon.

Approved bodyPrüfung durchOrganisme agrééAprobadoCollaudato

EN ISO

ENNoise DirectiveMachinery Directive

12100:2010

982:20082000/14/EC:20052006/42/EC:2006

Self

SelfSelfSelf

6. Special Provisions: None 7. Measurements: Measured Sound Power Level 122 LwASpezielle Bestimmungen: Messungen Guaranteed Sound Power Level 126 LwADispositions particulières: Mesures Measured in accordance to Directive 2000/14/EC,Provisiones especiales: Mediciones Disposizioni speciali: Misurazioni

8. Representative in the Union: Patrick Vervier, Stanley Dubuis 17-19, rue Jules Berthonneau-BP 3406 41034 Blois Cedex, France. Vertreter in der Union/Représentant dans l’union/Representante en la Union/Rappresentante presso l’Unione

Done at/Ort/Fait à/Dado en/Fatto a Stanley Hydraulic Tools, Milwaukie, Oregon USA Date/Datum/le/Fecha/Data 3-22-11

Signature/Unterschrift/Signature/Firma/Firma

Position/Position/Fonction/Cargo/Posizione Director of Product Development

DECLARATION OF CONFORMITY

MB256 User Manual ◄ 3

TABLE OF CONTENTS

SERVICING: This manual contains safety, operation and routine maintenance instructions. STANLEY Infrastructure recommends that servicing of hydraulic tools, other than routine maintenance, must be performed by an authorized and certified dealer. Please read the following warning.

To fill out a product warranty validation form, and for information on your warranty, visit www.stanleyinfrastructure.com and select the Company tab > Warranty.

Note: The warranty validation record must be submitted to validate the warranty.

SERIOUS INJURY OR DEATH COULD RESULT FROM THE IMPROPER REPAIR OR SERVICE OF THIS TOOL.

REPAIRS AND / OR SERVICE TO THIS TOOL MUST ONLY BE DONE BY AN AUTHORIZED AND CERTIFIED DEALER.

For the nearest certified dealer, call STANLEY Infrastructure at (503) 659-5660 and ask for a Customer Service Representative.

SAFETY SYMBOLS .................................................................................................................................................4SAFETY PRECAUTIONS .......................................................................................................................................5TOOL STICKERS & TAGS ......................................................................................................................................8OPERATION ............................................................................................................................................................9TROUBLESHOOTING ..........................................................................................................................................15MAINTENANCE .....................................................................................................................................................16CHARGING THE ACCUMULATOR ......................................................................................................................17FLOW CONTROL KIT INSTRUCTIONS ..............................................................................................................18WEAR TOLERANCES ...........................................................................................................................................19PROPER USE & CARE OF TOOL BITS ..............................................................................................................20FLOW TEST PROCEDURES ...............................................................................................................................24DEFINITION OF TERMS ......................................................................................................................................26SPECIFICATIONS .................................................................................................................................................27ACCESSORIES .....................................................................................................................................................28MB256 POWER CELL PARTS ILLUSTRATION ..................................................................................................29MB256 POWER CELL PARTS LIST .....................................................................................................................30MB25600 SIDE PLATES ........................................................................................................................................31MB25603 SIDE PLATE PARTS ILLUSTRATION .................................................................................................32MB25600SS MODEL MOUNTING BRACKETS...................................................................................................33MB25641 PARTS LIST & ILLUSTRATION ...........................................................................................................34


Always observe safety symbols. They are included for your safety and for the protection of the tool.

LOCAL SAFETY REGULATIONSEnter any local safety regulations here. Keep these instructions in an area accessible to the operator and maintenance personnel.

Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair actions which, if not strictly followed, could result in a life-threatening situation, bodily injury or damage to equipment.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

This safety alert and signal word indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

This safety alert and signal word indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.


This signal word indicates a potentially hazardous situation which, if not avoided, may result in property damage.

This signal word indicates a situation which, if not avoided, will result in damage to the equipment.

This signal word indicates a situation which, if not avoided, may result in damage to the equipment.

SAFETY SYMBOLS


Always observe safety symbols. They are included for your safety and for the protection of the tool.

LOCAL SAFETY REGULATIONSEnter any local safety regulations here. Keep these instructions in an area accessible to the operator and maintenance personnel.

Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair actions which, if not strictly followed, could result in a life-threatening situation, bodily injury or damage to equipment.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

This safety alert and signal word indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.



This signal word indicates a potentially hazardous situation which, if not avoided, may result in property damage.

This signal word indicates a situation which, if not avoided, will result in damage to the equipment.

This signal word indicates a situation which, if not avoided, may result in damage to the equipment.

WARNINGDo not operate the breaker unless the following safety instructions have been thoroughly read and understood! Read this manual before installing, operating or maintaining this equipment.

• A flying projectile from the breaker, breaker tool, rock or other material may enter the operator's compartment and cause serious or fatal injury to the operator. Personal protection equipment must be used.

• A flying projectile from the breaker, breaker tool, rock or other material may cause serious or fatal injury to bystanders. Never operate the breaker when bystanders are in the work area.

• On some machines/carriers, the breaker can enter the operator's compartment if it breaks loose and swings toward the operator. Make sure that suitable impact shields are used when operating the breaker with this type of equipment.

• Do not operate the breaker unless all safety decals described in this manual are in place. The decals must be inspected periodically to ensure that all wording is legible. The decals must be replaced if illegible. Replacement decals can be obtained from your authorized Stanley Distributor.

• When operating the breaker you must use ear protection, eye protection, and breathing protection.

Read the Manual

Wear EyeProtection

Wear HearingProtection

Wear BreathingProtection

WARNING

SAFETY PRECAUTIONS


Tool operators and maintenance personnel must comply with the safety precautions given in this manual and on the stickers and tags attached to the tool and hose.These precautions are given for your safety. Review them carefully before operating the tool and before performing general maintenance or repairs.Supervising personnel should develop additional precautions relating to the specific work area and local safety regulations. Place the added precautions in the space provided in this manual.

The Mounted Hydraulic Breaker will provide safe and dependable service if operated in accordance with the instructions given in this manual. Read and understand this manual , any stickers and tags attached to the tool and hoses before operation. Failure to do so could result in personal injury or equipment damage.

Check the rules and regulations at your location. The rules might include an employer’s work safety program. Regulations may identify hazards such as working around utility supply lines or hazardous slopes.

BE THOROUGHLY TRAINED BEFORE OPERATING THE UNIT ALONE• Operator training must start in an area without

bystanders and use all the controls until they can control the machine fully under the conditions of the work area.

• When learning to operate a machine, do so at a slow pace.

KNOW THE WORK CONDITIONS• The operator must know any prohibited uses or

work areas for the machine. For example, excessive slopes and poor or dangerous terrain conditions must be avoided.

OBEY SAFETY RULES• Operate the breaker in accordance with all laws and

regulations which affect you, your equipment or the work site.

• Do not operate the breaker until you have read this manual and thoroughly understand all safety, operation and maintenance instructions.

• The operator must be familiar with all prohibited work areas such as excessive slopes and dangerous terrain conditions.

• Do not operate the breaker until you read the carrier equipment manual and thoroughly understand all safety, operation and maintenance instructions. The word “carrier”, as used in this manual, means a backhoe or excavator or similar equipment used to operate the breaker.

• Ensure that all maintenance procedures recommended in this manual are completed before using the equipment.

• The operator must not operate the breaker or carrier if any people are within the area where they may be injured by flying debris or movement of the equipment.

• Know the limits of your equipment.• Establish a training program for all operators to

ensure safe operation.• Warning: Use of this tool on certain materials could

generate dust potentially containing a variety of hazardous substances such as asbestos, silica or lead. Inhalation of dust containing these or other hazardous substances could result in serious injury, cancer or death. Protect yourself and those around you. Research and understand the materials you are cutting. Follow correct safety procedures and comply with all applicable national, state or provisional health and safety regulations relating to them, including, if appropriate, arranging for the safe disposal of the materials by a qualified person.

• Do not operate the tool unless thoroughly trained or under the supervision of an instructor.

• Become familiar with the carrier controls before operating the carrier and the breaker.

• When operating the breaker you must use ear protection, eye protection and breathing protection.

• While learning to operate the breaker and carrier, do so at a slow pace. If necessary, set the carrier mode selector to the slow position.

• Make sure all controls (levers and pedals) are in the NEUTRAL position before starting the carrier.

SAFETY PRECAUTIONS


• While operating the breaker and carrier, keep hands and feet on the controls at all times.

• Before leaving the carrier, always lower the boom and insure the carrier is stable. Never leave the machine with the engine running. ALWAYS ENGAGE THE PARKING BRAKE.

• Stop the engine before attempting to make any repairs, adjustments or servicing to either the carrier or the breaker.

• Do not operate the tool at oil temperatures above 190 °F/88 °C. Operation at higher temperatures can damage the internal components of the breaker and carrier and will result in reduced breaker performance.

• Do not operate a damaged, leaking, improperly adjusted or incompletely assembled breaker.

• Do not modify the breaker in any manner.• Use only tool bits supplied by STANLEY. Use of tool

bits supplied by another manufacturer may damage the breaker and will void the warranty.

• To avoid personal injury or equipment damage, all breaker repair, maintenance and service must be performed by authorized and properly trained personnel.

• If you do not understand how to safely operate your breaker, contact an authorized STANLEY Dealer for assistance.

• Keep this manual with the breaker.• Do not operate this equipment if you are taking

medication which may affect your mental judgement or physical performance.

• Do not operate this equipment if you are under the influence of drugs or alcohol.

SAFETY PRECAUTIONS


47352Lifting Point Decal

74720 MB25600 / MB25603CE Specification Plate

74723 MB25600SSCE Specification Plate

74725 MB25641CE Specification Plate

NITROGEN ONLY

350 PSI27711Accumulator Pressure Sticker—350 PSI

NITROGEN ONLY


66218Sound Power Level—126 dBA

73004MB256 Decal

NITROGEN ONLY


66764Made in USA Decal

PN:73004

72074Grease Sticker

74705STANLEY Decal

74707 Used on Mb25600SS OnlySTANLEY Decal

TOOL STICKERS & TAGS

INSTANCE NAME fam.inst.param.name

fam.inst.name fam.inst.param.value


PRE-INSTALLATION INSTRUCTIONSBACKHOE OR EXCAVATOR SIZECheck the Specifications section of this manual to determine correct carrier size, hydraulic flow and pressure requirements.

If hydraulic pressure, hydraulic back pressure, hydraulic flow or carrier weight class are exceeded,

the tool warranty is void.

EXISTING EQUIPMENT HYDRAULICS VS. APPLICATION ATTACHING KITSUsing existing equipment hydraulic auxiliary systems for operating hydraulic tools could cause problems for the hydraulic tool and the hydraulic system if not set up properly. Do not connect to a hydraulic system without confirming pressure and flow to the hydraulic tool. Spare spool valves, dipper circuits, etc., are examples of easily accessible hydraulic circuits which could cause problems for hydraulic tool usage.

TEST THE HYDRAULIC SYSTEM1. Have your STANLEY dealer test the carrier hydraulic

system to make sure the system is operating at the manufacturers specified capacity and pressure ratings.

2. Be sure the fluid in the hydraulic system is filtered to at least 10 micro-meters. (Particles found in fluid should not exceed 10 micro-meters in size.)

3. Check the hydraulic filter. Replace the filter if dirty or deteriorated.

4. Have your STANLEY dealer test the circuit to which the breaker will be connected to make sure that the circuit is supplying the specified flow and pressure rating for the breaker. See the Specifications section of this manual.

PRE-OPERATION PROCEDURESNITROGEN CHARGEThe breaker has been properly charged with nitrogen at the factory and is ready to use.

TOOL BIT LUBRICATIONGrease the top 10 in. / 250 mm of the breaker tool bit before installing. During operation, the tool can be greased through the grease fitting. Grease is required.

Make sure the tool bit is against the piston by placing the tool bit against the ground and then putting down pressure on the breaker. See the illustrations on page 11.

250 mm/10 in.

Tool Bit

GreaseThis Areaof Bit

10 inches/250 mm

Figure 1. Greasing the Top of the Tool Bit

Greasing the tool bit without down pressure on the breaker results in grease filling the space between

the piston and the tool bit. When the breaker is next activated, the piston will strike the grease at a speed which will pressurize the grease resulting in seal and

grease zerk failure.

OPERATION


Piston in down position, pressurized by Nitrogen in accumulator

Tool bit pushed up against the piston

No gap between tool bit and piston

Tool bit NOT pushed up against the piston

Gap - grease will �ll this space

Figure 2. Positioning the Tool Bit with Lubrication

SECURING THE TOOL BIT1. The tool retainer (17) is shipped installed in the

breaker (see parts illustration).2. Drive out the tool retainer using a punch and

hammer.3. Grease the top area of the tool bit as shown in

Figure 1 page 9.4. Install the tool bit making sure the notch is aligned

with the lower body retainer pin hole.5. Install the tool retainer.

Always wear eye protection when installing or removing the tool retaining pin.

LOW TEMPERATURE WARM-UP PROCEDURE1. After starting the carrier, warm-up the hydraulic

system at engine idle until hydraulic lines are warm to the touch.

2. With the carrier at idle and the breaker suspended

in the air or with minimal down pressure, turn on the breaker to gradually warm up its internal components.

3. When the hydraulic system and breaker are warm, proceed with operation.

LONG TERM STORAGE1. Remove the tool bit, clean the tool stop and the

lower bushing. Thoroughly coat the surfaces of the tool stop and the lower bushing with grease.

2. If hoses are attached to the breaker, install plugs on the hose ends. If hoses are removed from the breaker, install plugs on the hose ends and install plugs in the breaker IN and OUT ports.

3. Store the breaker in a vertical position. Do not store the breaker horizontally for extended periods.

OPERATING A BREAKERPREPARATION FOR USERead the section in this manual titled Pre-Operation Procedures before operating a breaker. Failure to follow the preparation instructions can result in severe damage to the breaker and carrier and void the warranties of both.

POSITIONING THE CARRIER

SKIDSTEER LOADERSWith the breaker tool in place on the material to be worked, position the skidsteer loader arms and the breaker bracket so the breaker is almost vertical and the front tires of the skidsteer are off of the ground.Keep lowering the loader arms as the tool penetrates the work material so the skidsteer weight stays on the tool. The breaker is more efficient when adequate down force is applied.

OPERATION


Figure 3. Skidsteer LoaderBACKHOESWith the breaker tool in place on the material to be worked, position the backhoe so the boom is halfway up (45°) and the dipper holds the breaker almost vertical. Lower the loader bucket until the weight is off the front tires.

Apply down pressure.

Figure 4. BackhoeApply down force to the boom/dipper until the rear of the backhoe is raised off the ground. Rear tires and stabilizers should be off the ground so the total rear weight of the backhoe is on the breaker tool. The breaker is more efficient when adequate down force is applied.EXCAVATORSWith the breaker tool in place on the material to be worked, position the excavator so the dipper is at approximately 45° and the breaker is almost vertical. The tracks of the excavator should be in line with the boom and the breaker.

Apply down force.

Figure 5. Excavator

POSITIONING THE BREAKER TOOL ON THE WORK MATERIALPosition the tool bit near the edge of the work material, not in the center or far from the edge. Position the tool 6–18 inches (depending on the material) from the edge. Breaking off smaller pieces of rock or concrete usually accomplishes more than trying to break larger pieces.

Break near the edge.

Figure 6. Position the Tool BitOn flat material or rock, the breaker should be vertical or “curled” back slightly to direct the impact force downward and toward the backhoe. This directs the force back toward the edge of the work material. If the tool is positioned in the center of the work, or too far from the edge, the energy will be absorbed into the material without cracking it. Do not run the breaker longer than 15–20 seconds. If breakout does not occur within this time, move the breaker to another position.On flat material such as concrete runways, starting to break in the middle of the material may cause vibrations to be transmitted throughout the breaker and excavator because the material has no place to break to. Always

OPERATION


try to start at a point which will permit the material to break out.

MAINTAIN DOWN PRESSUREMaintaining hard contact with the surface of the material to be broken in addition to maintaining adequate “down force” is very important. Always keep “down pressure” or “down force” on the point of the breaker by lifting the wheels, tracks, or stabilizers slightly above the ground. This method takes the “slack” out of the bracket and boom pivots, and reduces the impact on the pivots in the boom.The operator needs to be constantly aware of the amount of down pressure being applied and be able to adjust it if necessary. Not enough down pressure results in low production and accelerates wear and tear on the equipment. Too much down pressure may cause the breaker housing to violently crash into the broken material when “break-through” occurs.In any breaking job, the operator should make every effort to “follow” the breaker with “down pressure” as the machine breaks farther into the material. The breaker should be stopped as soon as “break-through” occurs or if it is apparent that good solid blows are not occurring.

BREAKINGThe operator should note the sound of the blow when the breaker is running. With experience, the operator will be able to tell the difference between a good solid blow and a hollow sounding blow. A hollow blow means that solid blows are not occurring and breaker should be repositioned.Continuous tool penetration usually does not do much good. If the material does not break with 3–6 inches of tool penetration, it usually won’t break with full penetration. The time used for additional penetration could be better used to strike blows in another place.Many materials do not respond well to continued hammering in one place. The breaker tool should be repositioned on the work each time the tool penetrates but does not crack the material.

Do not break continuously in one place.

Figure 7. Breaking

Continuous penetration in the same area for lengthy periods will create excessive temperatures at the tip of the tool bit resulting in loss of temper (hardness) of the bit, mushrooming of the tip of the bit and may

lead to failure of the bit.

Use a “scoring” method of breaking when cracking the material becomes difficult. This technique involves striking the rock or concrete at several places along a line where you want the crack to occur. Most materials break sooner when struck several places along a line than when struck repeatedly in one location. On each line, the breaker tool should be continually repositioned. Practice determines the best length of time to stay in one spot (15–20 seconds) and how far to move the breaker tool.

Scoring with the breaker

Figure 8. Scoring with the BreakerBreaker tool binding can cause erratic breaker operation and premature wear on the tool shank. Breaker tool

Do not break continuously in one place

OPERATION


binding is caused by failure to direct the down force in the direction of the tool bit.

Breaker tool bit binding

Figure 9. Breaker Tool Bit Binding

Do not pry with bit and breaker. The tool bit may break causing injury.

Excessive side force cocks the tool in its bore, prevents proper movement and causes premature tool shank and bushing wear. Since the breaker tool bit must be pushed up into the breaker to operate, a binding tool prevents the breaker from operating correctly. Binding also causes the tool bit and tool bushings to seize and often results in breakage of one or more breaker components.Always direct the down pressure force in a line toward the point of tool contact with the work.Moving rocks with the tool bit is another method of binding the tool bit. This practice should be avoided as it may cause tool bit failure.Rebar reinforced concrete introduces the problem of concrete chunks being held together by the rebar after the concrete has been broken. The best approach to this problem is to use a chisel point tool which permits cutting the rebar with the breaker. Another method is to periodically cut the rebar with an oxy-acetylene torch.

BLANK FIRINGTo understand “Blank Firing”, the operator needs to be aware that the tool bit is able to drop down in the lower body cavity, far enough so that the piston cannot strike it, when the tool bit is not in contact with the work surface. “Blank Firing” occurs whenever the breaker is operating

and the piston is not able to strike the tool bit solidly or not strike the tool bit at all. “Blank Firing” accelerates wear and tear on breaker and carrier components and may result in failure of one or more components. Excessive “Blank Firing” may be considered equipment abuse and may result in voiding warranties.Break-through or difficult surface contact results in “Blank Firing” when the material being broken fractures and the tool bit is no longer in “hard contact” with the material but is still pushed high enough in the lower body cavity so that the piston can strike it. In this position, the piston strikes the tool bit and the tool bit, in turn, is driven against the retaining pins because it is not in sufficient contact with the material to be broken. The energy is absorbed by the retaining pins, other breaker components, and the carrier boom components. “Blank Firing” of this type can be experienced in trench work where obtaining striking contact with the work surface is difficult or the wrong tool bit is used, or in flat rock work where the operator fails to stop operation of the breaker when slippage, fracturing or material break-through occurs.“Blank Firing” as a result of operator error occurs when the tool bit is not in contact with the work surface to be broken and is allowed to drop down in the lower body cavity so that the piston is not able to strike it. Instead, the downward movement of the piston will be stopped by an internal oil cushion located at the bottom of the piston’s stroke and the energy of the piston will be absorbed by breaker components and excavator boom components. “Blank Firing” of this type can be experienced when the operator fails to stop operation of the breaker when the material fractures or material break-through occurs, or during re-positioning of the breaker.While “Blank Firing” cannot always be avoided, it can be kept to a minimum by avoiding the above conditions as much as possible.

UNDERWATER USAGEUnderwater usage of the breaker will cause damage to internal components. Even if the breaker is partially submerged, water is introduced to an area between the tool bit and piston. On the piston down cycle, the water becomes compressed and damages adjacent components.

OPERATION


Do not use underwater without supplying air to breaker.

Figure 10. Underwater Restrictions

No part of the breaker may be submerged in water. Underwater usage of the breaker will cause internal

damage to the breaker. Consult STANLEY for modifications and specific warranty coverage if you

have an underwater requirement.

GREASE THE BITGrease should be applied to the upper end of the breaker tool bit each time it is installed. Thereafter, the tool should be greased at the fitting to reduce wear in the lower body and bushings of the tool. See Greasing The Tool Bit in the sections titled Pre-Operation Procedures.

UNDERWATER USENo part of the STANLEY MB256 Breaker may be

submerged in water without first modifying the breaker for underwater use. Use of the breaker

underwater requires an underwater application kit and an air compressor capable of producing 150 cfm @ 75 psi. Underwater usage of the breaker without

the underwater kit and air compressor will cause internal damage to the breaker. See the Accessories

section of this manual to order the underwater kit.

Do not use underwater without supplying air to breaker

OPERATION


This section describes how to find and resolve problems users may experience. If a situation occurs that is not covered, call your STANLEY Customer Service Representative for assistance.

PROBLEM CAUSE SOLUTIONBreaker will not fire. Low hydraulic oil level. Fill reservoir.

No flow to breaker. Have hydraulic circuit tested by authorized dealer/distributor per approved procedure.

Main relief set low.

Internal damage. Have unit serviced by an authorized dealer/distributor.

Damaged quick couplers. Replace.Breaker runs slowly. Low hydraulic flow Have hydraulic circuit tested by an

authorized dealer/distributor per approved procedure.

Excessive heat build up.

Excessive nitrogen pressure. Have unit serviced by an authorized dealer/distributor.Internal leakage.

Breaker runs erratically. Low or excessive back-pressure. Have carrier serviced by an authorized dealer/distributor.Damaged switch or connection.

Relief set too low.Internal damage.Tool binding. Add grease to tool shank. Do not pry

while operating.Breaker runs but at reduced power.

Low accumulator charge. Have unit serviced by an authorized dealer/distributor.Excessive back-pressure.

Relief set too low.Breaker leaks oil around tool bit and tool bushing.

Lower seals failed. Have unit serviced by an authorized dealer/distributor.

Hydraulic system overheats. Main relief set low. Have unit serviced by an authorized dealer/distributor.Insufficient cooling capability in

hydraulic circuit.Line/hose size too small.Excessive back-pressure.

If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.When diagnosing faults in operation of the tool, always check that the hydraulic power source is supplying the correct hydraulic flow and pressure to the tool as listed in the table below. Use a flowmeter known to be accurate. Check the flow with the hydraulic oil temperature at least 80 °F/27 °C.Inspecting the tool or installing parts with the

hydraulic hoses connected can result in severe personal injury or equipment damage. To prevent accidental startup, disconnect the hydraulic power

before beginning any inspection or installation task.

TROUBLESHOOTING


DAILY MAINTENANCE CHECKS• Check for loose or missing fasteners. Tighten or

replace as needed.• Inspect tool retaining pins and pockets for wear.• Check for hydraulic leaks at all fittings and hoses.

Replace any defective hoses.• Apply grease to the grease fitting in the lower body

each morning. Grease as needed throughout the work day.

TOOL STOP AND LOWER BUSHINGInspect the tool stop and lower bushing for excessive galling and metal pickup on the tool bit. Also check for cracks. If cracks are present, the part must be replaced.The extent of wear of the tool stop and lower bushings and the tool bit can be checked by moving a NEW tool bit back and forth and measuring the gap between the tool bit and the lower bushing. If the gap is more than .250 in./6 mm, the upper bushing, lower bushing and tool bit should be replaced. A gap in excess of .250 in./6 mm will cause damage to the piston. Do not just replace the tool bit or the lower bushing individually as this will result in premature wear of the replaced component. It is recommended to replace ALL worn components.

18 inches

Figure 11. Measuring Tool Bit Gap

MAINTENANCE


Figure 12. Charge Pressure Specification For the MB256

505232 Charge Hose Assy (includes gauge, valve, hose and charge valve adapter)

28257 Tester

Nitrogen Bottle (locally obtained)

Manifold Accumulator

Surge Accumulator

Main Accumulator

CHARGE PRESSURE SPECIFICATIONMain Accumulator: 350 PSI +/- 20 PSI - 24 BAR +/- 1.4 BARManifold Accumulator 300 PSI +/- 20 PSI - 21 BAR +/- 1.4 BARSurge Accumulator 1000 PSI +/- 20 PSI - 69 BAR +/- 1.4 BAR

The tools required to charge the accumulators are the 505232 Charge Hose Assembly and the 28257 accumulator tester, which are used with other STANLEY model breakers. When charging the accumulators, make sure the tools and charge valves are clean. Dirt can contaminate the charge valves and cause leakage.

1. Remove the protective plug from the accumulator charge valve.

Note: There are three accumulators on this breaker; the main accumulator, the manifold accumulator and the surge accumulator.

2. Hold the chuck end of the tester and turn the gauge fully counter clockwise to ensure the plunger inside the chuck is completely retracted.

3. Screw the tester into the breaker charge valve by turning the chuck. Do not use the gauge for turning as this will advance the plunger in the chuck. Tighten the chuck lightly against the breaker charge valve.

4. Turn the gauge clockwise to advance the plunger until a pressure is indicated on the gauge. Do not

overtighten.5. If the pressure is correct, unscrew the gauge to

retract the plunger. Then, loosen and remove the tester from the charge valve. If the pressure is not correct, proceed to step 6.

Note: When disengaging the tester a "POP" of nitrogen is normal.

6. Connect the charge hose assembly to the charging valve on the tester. Make sure the valve on the charge hose assembly is closed. Open the valve on the nitrogen bottle.

7. Very slowly open the valve on the charge hose assembly and slowly meter the nitrogen into the breaker charge valve until the tester reads the correct charge pressure.

8. When the correct pressure is obtained, close the valve on the charge hose assembly and on the nitrogen bottle. Unscrew the gauge to retract the plunger. Loosen and remove the tester from the charge valve. Before replacing the protective plug, inspect the plug O-ring. If damaged or deformed, replace the plug. Apply Loctite™ 242 to plug and cap.

CHARGING THE ACCUMULATOR


The Flow Control Kit is an option for Skid Steer Models. The Flow Control Kit regulates the flow from the skid steer hydraulics to the breaker to prevent over-speeding of the breaker. Follow the instructions below to install the kit.• Install the flow control block between the breaker and

the loader’s hydraulics using the 7/16 in. capscrews, washers, and nuts provided. (Torque to 41 ft-lbs)

• Connect the hoses.The parts list for the Flow Control Kit is shown below.

HOSE ROUTINGSR = Return. Route to the breaker OUT port.S = Supply. Route to the breaker IN port.P = Pressure. Route to the tractor’s hydraulic pressure.T = Tank. Route to the tractor’s hydraulic reservoir.

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ITEM NO.

PART NO. QTY DESCRIPTION

1 34621 1 FLOW CONTROL BLOCK

2 34839 6 WASHER

3 371516 3 NYLOCK NUT

4 02773 4 ADAPTER

5 58653 1 ORIFICE LOCATED UNDERFITTING DESIGNATED AS "S"

6 58652 3 CAPSCREW

7 58654 2 HOSE

8 58655 2 HOSE

Figure 13. Flow Control Kit

FLOW CONTROL KIT INSTRUCTIONS


NEW REJECT LIMIT

LOWER BUSHING (ITEM 14)

2.525 in./64.1 mm 2.650 in./67.3 mm

TOOL STOP (ITEM 15)

A) 2.525 in./64.1 mm Inside Diameter

A) 2.650 in./67.3 mm Inside Diameter

B) .60 in./15.2 mm Depth B) .48 in./12 mm Depth

RETAINER PIN (ITEM 17)

1.745 in./44 mm Outside Diameter

1.66 in./42 mm Outside Diameter

RETAINER PIN (ITEM 16)

.25 in./6 mm Outside Diameter

.18 in./4.6 mm Outside Diameter

PISTON (ITEM 44)

1.80 in./46 mm Depth 1.76 in./45 mm

LOWER BUSHING

RETAINER PIN

TOOL STOP

Wear Areas

C=Measure at 1.2 in./30 mm

A B

C

PISTON

New Part

Wear Limit

WEAR TOLERANCES


Tool bits are made and heat treated to specification.Tool bits, however well made, are wear parts, and are used in the most destructive applications. Even when the hydraulic breaker is used properly, and the operator is an experienced one, a tool bit may become damaged. When a tool bit has been damaged, it is useful to determine the cause immediately in order to prevent the damage from occurring again.All STANLEY tool bits are machined and hardened for maximum performance. Care must be taken to maintain the tools original condition for optimum productivity and life expectancy. It is not uncommon for an operator who is unfamiliar with using a hammer to break a point. This is part of the learning experience.Listed below are several methods to determine tool failure and will quickly aid in warranty determination.

TOOL FAILURE NOT COVERED UNDER WARRANTYBLANK FIRING OR FREE RUNNINGThis occurs when the tool is not in proper contact with the work, thus causing the energy produced by the hammer to be concentrated on the tool retainers and the retainer slots on the tool itself. Caution should be used to prevent the hammer from sliding off slanted surfaces or when breaking through thin material.The illustration below is typical of the kind of breakage that occurs from excessive blank firing.

Figure 18. Excessive Blank Firing Breakage

WORN-OUT FRONT BUSHING(S) OR RETAINER PIN(S)Worn-out front bushings will cause the tool to become misaligned inside the hammer. This misalignment will cause uneven contact between the piston and tool, thus causing stress to concentrate on one particular area of the tool. This can also cause the tool to bind inside the hammer. Call your dealer for acceptable wear allowances.Worn-out retainer pins will cause uneven loading on the pins themselves, causing failure of the tool or retainer pins. This will also cause excessive wear to the front bushings.

METAL-TO-METAL CONTACTExtreme caution should be used to avoid scratches or gouges on the surface of the tool. These areas create a stress concentration metal-to-metal Contact point, thus weakening the tool.Another form of metal-to-metal contact is galling, which usually occurs from the lack of lubrication. Special care should be taken to keep the tool shank lubricated every two (2) to three (3) hours.Steel failures that were caused by surface damage take two main forms. The simplest form is caused by deep scratches on working steel surface. The broken surface has a shell pattern around the starting point of failure, similar to the one in the fatigue failure. The other parts of the broken surface are brittle. These failures work slowly through the steel until it suddenly parts completely.The second form of failure caused by surface damage occurs when there are deep scratches on working steel surface and there was also excessive bending stress. The broken surface also shows the shell pattern, but the other parts of the broken surface are brittle and usually have a “lip” like that in a stress failure.

Figure 19. Metal-to-Metal Contact ExamplesIn its most extreme forms, the combination of surface damage and severe bending can quickly break even the best working steels.The illustrations below show examples of severe stress breaks.

PROPER USE & CARE OF TOOL BITS


Figure 20. Severe Stress Breaks

PRYINGThis is the most common cause of tool failure. Even when there is no surface damage, the stress from prying can easily break a working steel. This kind of failure generally results from any type of side pressure such as an incorrect breaking angle or from using the tool to reposition material. The tool should not be used as a pivot point when repositioning the carrier. The power generated by the carrier will far exceed the strength of the tool.

Figure 21. Prying Damage ExampleSimilar failures can also occur when the steel is used with extreme down pressure, and the steel repeatedly slips off the work at an angle, or the material, itself moves from under the working steel.

Figure 22. Extreme Down Pressure BreakageAs the next illustration shows, fatigue failures take many forms, but they all exhibit similar features. Generally, the broken surface is brittle and has a “lip” like that in the bending failure, even though, in some cases, the lip has been broken.

Figure 23. Fatigue Failures

CORROSIONTools should be greased and stored out of the weather. Corrosion tends to accelerate the fatigue fractures of the tool.

MUSHROOMINGDriving the tool into a hard material for a long period of time generates an intense heat, indicated by a blue tone just above the point. This will soften the steel and cause the point to fold over or mushroom the end of the tool. Avoid hammering in one location for too long. If material does not break after a short period (approximately 15 to 20 seconds), reposition the tool.

Figure 24. MushroomingIf the overheated steel is suddenly cooled by being dipped in standing water, for example, the metal will harden and become brittle. These are some examples of failure caused by temper changes occurring on the job.



TOOL FAILURE COVERED UNDER WARRANTYINTERNAL MATERIAL FLAWThis failure occurs when a foreign material is rolled into the steel during the manufacturing process, causing an imperfection in the internal material flaw grain. The result is an inherent weakness in the tool shank and eventual breakage.The fatigue failure is started by the defects within the tool bit. The broken surface exhibits a shell pattern around the starting point of failure, like that in the fatigue failure. The other parts of the broken surface are brittle.This is the only kind of tool bit failure that is always covered under warranty.

Figure 25. Internal Material FlawAs a rule, working steel failures can be diagnosed by looking at the break itself, and at the place on the steel where the break occurred. Discoloration, like “rainbow” effects or blue bands, is the result of extreme heat.Look for surface cracks, galling, or gouge marks. Breaks that start as surface damage have a “sea shell” pattern, with the damaged spot at the center. A large “sea shell” indicates a slow growing break; a small one indicates one compounded by side stress.Stress failures start small, and spread into the center of the steel. In a stress failure, the coarser the grain, the greater the stress was, and the more rapid was the failure.

• Failures in this area are usually the result of blank firing, worn bushing(s), worn retainer pin(s) or the lack of lubrication.

• Failures in this area are usually the result of worn retainer pin(s) or blank firing.

• Failures in this area are usually the result of prying, metal-to-metal contact or corrosion. Prying failures often exhibit a shell-like formation near the edge of the steel diameter where the break began, and a “tail” opposite that where the remaining steel bent and tore.

• Failures in this area are usually the result of heat build-up, mushrooming, or improper contact with the work.

Figure 26. Diagram of Tool Bit Failures



STANLEY Breakers are available with several different types of tool bits. The most common are the moil, chisel and the blunt. Each of these working steels has its own purpose as described below.To obtain the maximum production from the breaker, it is important to select the proper working steel. Consult your STANLEY representative for assistance in selecting the proper working steel for your application.

MOILThis is by far the most popular working steel. It is a general purpose point used to break anything from concrete to hard rock. Its pencil-type point is used to fracture the material. The tool is best where penetration speed is important.

CHISELThis style of point is used generally used for trench work, where a controlled break is required, and for rock breaking on materials with a definite line of cleavage. A chisel bit also works well in softer concretes where a moil might penetrate quickly, but not cause a fracture line.

BLUNTThis flat type of point is used to break softer material such as coal or shale. A moil or chisel will tend to punch holes in this type of material, where a flat blunt will shatter the material. It is also useful when breaking irregularly shaped material where its broad tip makes it easier to position.



The correct performance of this procedure will verify if the auxiliary circuit of the carrier is adequate to properly operate a STANLEY attachment.This procedure is generic in form. It is the end users responsibility to ensure that this procedure will work with his specific type of equipment.If an adequate flow meter is not available contact your STANLEY Distributor for assistance.

TEST PROCEDURE1. With the auxiliary circuit (or kit) completely installed

connect the flow meter between the tool inlet and outlet hoses.

Note: Always use the hoses that are supplied for the attachment and make sure the machine hydraulic oil is between 90 to 120 °F. This will assure correct readings and adjustments.2. With the machine setting at the mode that’s going to

be used to operate the attachment, record the GPM _____.Locate the correct flow for the attachment in the manual under the specification section. Adjust the machine to the correct GPM.

Note: If possible, always set the machine to the highest GPM output mode. This will prevent the operator from over flowing the attachments.3. Once the correct GPM flow is achieved fully open

the restrictor on the flow meter.4. With the machine in the attachment mode set in

step 2 record the back-pressure. At this point the pressure reading on the pressure gauge is the back-pressure in the circuit. This pressure must not exceed 200 psi/13.5 bar.Excessive back-pressure will slow the attachments operation and lead to premature seal failures and over heating.

Record the back-pressure psi.5. Close the restrictor valve on the flow meter until

the attachment relief starts to crack or open. The relief valve opens when the flow rate (GPM), indicated on the flow meter begins to decline rapidly. Locate the tools operating system relief pressure in the specification section in the manual. Adjust attachment relief to specification.

Note: The relief valve pressure must be greater than the operating pressure of the attachment and three times the back-pressure. Never use the relief valve to control the flow rate in the circuit. Cracking pressure means the loss of 4 or more GPM.

Record the relief cracking pressure psi.Example:Operation pressure of a breaker is 2700 psi. Back-pressure is 150 psi. A good rule to follow when setting the relief, multiply the back pressure by 3 then add this number to the operation pressure of the attachment.Operating Pressure: 2700 psiBack-pressure: 450 psiOperating pressure of the tool: 3150 psiThe relief valve setting must be greater than the estimated operating pressure of the tool. If the setting is lower, damage to the circuit may occur. Excess heat will be generated in the circuit which will damage the attachment and carrier.

HEAT LOAD TESTWith the installation kit properly installed and adjusted per the above procedure, conduct the heat load test as follows.1. Connect the flow meter between the tool inlet and

outlet hoses.2. With the carrier set in the attachment mode,

restrict the flow meter until a pressure of 1000 psi is achieved. This pressure must be maintained throughout the heat test.

Note: Closing of the restrictor may be required as the temperature increases.Monitor the oil temperature from the flow meter until no change is noted. Record the time required for oil to stabilize. Record the surrounding temperature (ambient temperature). Record the time required to stabilize minutes.Record the stabilized oil temperature °F.Record the ambient temperature °F.

FLOW TEST PROCEDURES


The “heat rise” is calculated as the stabilized temperature minus the ambient temperature.Example:Stabilized Temperature: 160°Ambient Temperature: -80°Heat Rise: 80°The normal operating temperature range of this circuit will be the typical ambient temperature range for the geographical area plus the heat rise calculated above. Ensure that the operating temperature range is lower than 180° for optimum operation of the attachment.

TROUBLESHOOTINGIf adequate pump flow is available from the carrier pump but is not getting to the attachment, consult your service representative and review the following:1. Attachment valve(s) are not actuating. Review all

electrical connections that are part of the attachment kit.

2. Ensure proper voltage to the valves.3. Ensure the REG port of the valve is not blocked.4. Check to make sure the carriers main relief is set

to the manufacturers recommendation and that this value is equal or greater than the attachment circuit relief.

5. If the valve will not turn off, check the drain (tank) line of the valve to ensure that the pressure is 50 psi or less.

FLOW TEST PROCEDURES


DEFINITION OF TERMS

Tool: The hydraulic attachment which the auxiliary circuit is intended to power. These may include hydraulic breakers, compactors, shears, etc.

Operating Pressure: That pressure at which the tool will naturally operate without influence of outside pressure relief mechanisms. This pressure is an operating characteristic of the tool and cannot be altered by the end user without changing the tool design.

Relief Pressure: The relief pressure is that pressure at which the circuit will dump fluid in order to protect itself from damage.

Back Pressure: The pressure at the tool’s connection to the return circuit of the carrier.

Flow Meter: Instrument for testing the operating characteristics of a hydraulic circuit. The data usually available from this device are pressure (psi/bar), flow (GPM/LPM) and temperature (°F/°C).

Restrictor Valve: A valve on the flow meter which allows the user to simulate an operating tool by adding a pressure load (through restriction) to the circuit. This feature is used to evaluate relief settings and flow ratings at pressure.

V60/V65/V100 Valves: A priority flow control valve manufactured by STANLEY. Allows for optimum operation of any attachment by providing the proper amount of flow for operation of the tool the “priority” aspect allows the attachment to function properly if another control function is activated.

Inlet Flow: The hydraulic oil supplied to the “IN” port of the tool or valve.

Regulated Flow: The flow of oil supplied to the tool by the V60/V100 valve.

By-Pass Flow: The oil flow that is supplied by the carriers pump, but not used in the operation of the attachment. By-pass flow equals inlet flow (to the valve) minus the regulated flow.

Pressure Line: The hydraulic lines which supply pressurized oil from the pump to the valve or tool.

Return Line: The hydraulic line which connects the “OUT” port of the tool to the tank circuit of the carrier.

Cracking Pressure: The pressure at which the relief valve starts to open. Can be seen by a drop in the flow rate as shown by the flow meter.

Full Open Pressure: The pressure at which the relief valve is completely open dumping all system flow to the tank.

Ambient Air Temperature: The temperature of the outside air.

Stabilized Temperature: The temperature at which the carrier hydraulic system temperature will stop rising during testing or operation.


MB256Dimensions and Weights

Weight w/Tool Bit, & Mounting Bracket ..................................................................................493 lbs / 224 kgLength w/Tool Bit & Mounting Bracket ................................................................................. 51 in. / 1295 mmTool Working Length .............................................................................................................. 15 in. / 381 mmTool Diameter ......................................................................................................................... 2.5 in. / 64 mm

Hydraulic Pressure (working) ...........................................................................................1400-1700 psi / 96-117 barFlow Range

Minimum ............................................................................................................................. 9 GPM / 34 LPMMaximum ........................................................................................................................... 16 GPM / 60 LPM

System Relief (min. cracking) ......................................................................................................... 2500 psi / 172 barReturn Line Pressure (max.) ........................................................................................................... 200 psi / 13.8 barOperating Oil Temperature (max.) .......................................................................................................... 190°F / 88°CAdapter Fitting Size ........................................................................................................................... -12 SAE O-RingRecommended Min. Hose ID ............................................................................................................................ 3/4 in.Blows Per Minute....................................................................................................................... 700 min. / 1200 max.Impact Energy Class .......................................................................................................................... 350 ft lb / 475 JSound Power Level ...................................................................................................................................... 122 dBACarrier Size (Skidsteer) ............................................................................................... 3000-7000 lbs / 1362-3178 kg Carrier Size (Mini Excavator)..................................................................................... 4000-10000 lbs / 1816-4500 kgCarrier Size (Backhoe) ............................................................................................. 4000-10000 lbs / 1816-4500 kg

Note: Weights, dimensions and operating specifications listed on this sheet are subject to change without notice. Where specifications are critical to your application, please consult the dealer.

SPECIFICATIONS


Description ................................................................................................................................................... Part No.Tool BitsAsphalt Cutter, Cross-cut...................................................................................................................................25170Asphalt Cutter, Line-cut .....................................................................................................................................25171Conical...............................................................................................................................................................27281Chisel, Cross-cut ...............................................................................................................................................27282Chisel, Line-cut ..................................................................................................................................................27283Blunt ..................................................................................................................................................................27284Tamping Pad Assy 12 in. x 12 in........................................................................................................................27286

MiscellaneousAttaching Kits....................................................................................................................................... Consult DealerAdapter Assembly..............................................................................................................................................33300Charge Hose Assembly (Includes Valve and Hose for Nitrogen Tank & Charge Valve Connections) .............505232Charge Kit Assembly (Includes p/n 505232, 28257 and 372047 Charge Kit Box) ............................................34892Accumulator Tester ............................................................................................................................................28257Puller .................................................................................................................................................................40374Conversion Kit to Adapt Breaker to Skidsteer ...................................................................................................56599Seal Installation Tool ..........................................................................................................................................29560Piston Sleeve Installation Tool ...........................................................................................................................29564O-Ring Tool Kit ..................................................................................................................................................04337Lifting Ring....................................................................................................................................................... 372110

TORQUE TABLEItem No. Illustration Description Apply Ft/Lb Nm

61 Power Cell Tie Rod Kopr Kote™ 500 67858 Power Cell Charge Valve Loctite™ 242 75 10126 Power Cell Capscrew Loctite™ 242 60 8174 Side Plates Nut Kopr Kote ™ 280 38066 Power Cell Accumulator Cap Anti-Seize 600 813

ACCESSORIES


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16

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29

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3435

3637

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5455

56

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MB256 POWER CELL PARTS ILLUSTRATION58 59Valve

Assembly Accumulator Assembly

57Power Cell Assembly

60Surge Accumulator Assembly


Item MB256 Qty Description2 13854 1 O-RING 2-5/8 X 2-7/8 X 1/8 -2313 16549 1 DOWEL PIN 1/2 X 1-1/4 LG.4 19095 1 O-RING 5/8 X 13/16 X 3/32 -1145 22834 1 UPPER ACCUMULATOR6 22908 1 PISTON SLEEVE7 22940 1 PISTON8 22943 1 SEAL CARRIER9 22946 1 MODIFIED QUAD RING10 22971 1 TOOL RETAINER PIN11 22981 4 TIE ROD12 22993 4 TIE ROD WASHER13 22995 1 ROD SEAL (DISOGRIN #001-143)14 22996 1 BACK-UP RING -23315 22998 2 O-RING 3 X 3-1/4 X 1/8 -23416 23012 2 O-RING 2-3/4 X 3 X 1/8 -23217 23324 2 O-RING 7/8 X 1-1/8 X 1/8 -21218 23461 1 LOWER BODY ASSEMBLY (INCLUDES

ITEMS 32, 33 & 41 thru 46)19 23492 8 HSHCS 7/16-14 X 1-3/420 24115 2 O-RING 2-7/8 X 3-1/8 X 1/8 -23321 27267 1 ACCUMULATOR PLUG22 27268 1 ACCUMULATOR DIAPHRAGM23 32165 2 CHARGE VALVE ASSY24 34520 1 MAIN BODY ASSY (INCLUDES ITEMS

21, 22 28 thru 31 and 34 thru 39)25 66117 1 ACCUMULATOR MANIFOLD26 22966 1 VALVE CAP27 350223 4 HOLLOW HEX PLUG -12 SAE28 350237 2 HOLLOW HEX PLUG29 350041 5 HOLLOW HEX PLUG

30 23012 2 O-RING

31 34020 1 ACCUMULATOR SCREEN

32 23011 4 SPIROL PIN

33 372003 1 GREASE FITTING

34 32165 1 CHARGE VALVE ASSY.

35 34101 1 LOCKPLATE

36 34113 1 LOCK TAB

37 34100 1 RETAINING RING

38 22999 1 ROD SEAL

39 23000 1 ROD WIPER

40 00961 1 PIPE PLUG

41 22978 2 DOWEL PIN

42 09728 2 PIN RETAINER SPRING

43 09764 2 PIN RETAINER

Item MB256 Qty Description44 22980 2 RETAINER SPRING

45 23178 1 TOOL STOP

46 22979 1 LOWER BUSHING

47 02177 1 O-RING

48 26201 1 O-RING

49 22954 1 SPOOL SLEEVE

50 22951 1 VALVE SPOOL

51 22947 1 VALVE SLEEVE

52 23008 1 O-RING

53 23006 1 O-RING

54 23004 1 O-RING

55 23003 1 BACK UP RING

56 19084 1 O-RING57 38718 1 POWERCELL ASSY

58 66450 1 VALVE ASSY (INCLUDES ITEMS 26 & 47 thru 56)

59 66121 1

ACCUMULATOR ASSY (INCLUDED ITEMS 21, 22, 23, 25 also item 14 from side plate illustration) and (04858 Hex Plug)

60 66407 1 SURGE ACCUMULATOR ASSY (INCLUDES ITEMS 21, 22, 31, 34)

SK 23460 1 SEAL KIT (MB256)

MB256 POWER CELL PARTS LIST


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24NOTE: WHEN ORDERINGITEM # 14 SIDE PLATE BOLTSCHECK THE LENGTH, THEOAL SHOULD BE 8.450 ANDTHE LENGTH FROM THE BOLTHEAD TO THE END OF THETHREADS IS 7.800.

MB25600 SIDE PLATES

Item # Part # Qty Description4 23573 4 LOCKPLATE6 27711 1 PRESSURE SPEC STICKER -

350 PSI7 27995 4 RETAINING RING EXTERNAL 8 34522 1 PRESSURE SPEC STICKER -

1000 PSI9 37916 4 SIDEPLATE NUT10 38718 1 POWERCELL ASSY.11 47351 1 DECAL, COMPOSITE WARNING12 47352 2 DECAL, LIFT POINT13 56595 1 PRESSURE SPEC STICKER -

300 PSI14 62374 4 SIDEPLATE BOLT

Item # Part # Qty Description15 66218 1 GUARANTEED SOUND POWER

LEVEL16 66764 1 DECAL, USA ORIGIN 3"17 69523 1 SIDEPLATE WELDMENT - LH18 69524 1 SIDEPLATE WELDMENT - RH19 72074 1 DECAL, GREASE20 73004 2 DECAL, MB25621 74705 2 DECAL, "STANLEY" 11 INCH22 74720 1 DECAL, CE MB25600/25603

74723 DECAL, CE MB25600SS74725 DECAL, CE MB25641

23 371052 4 WASHER 3/4” I.D24 27281 1 CONICAL TOOL BIT


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NOTE: WHEN ORDERING ITEM # 13 SIDE PLATE BOLTS

CHECK THE LENGTH, THE OAL SHOULD BE 9.150 AND

THE LENGTH FROM THE BOLT HEAD TO THE END OF THE

THREADS IS 8.500.

MB25603 SIDE PLATE PARTS ILLUSTRATION

Item # Part # Qty Description1 05967 1 STRAIGHT THREAD ELBOW 2 17559 12 WASHER 7/8" I.D.4 21335 1 LONG ST THRD ELBOW5 22181 6 NYLOCK NUT 7/8-9UNC6 23573 4 LOCKPLATE8 27711 1 PRESSURE SPEC STICKER - 350

PSI9 27995 4 RETAINING RING EXTERNAL11 30949 6 HHCS 7/8-9UNC X 3.00012 34522 1 PRESSURE SPEC STICKER - 1000

PSI13 37915 4 SIDEPLATE BOLT14 37916 4 SIDEPLATE NUT15 38718 1 POWERCELL ASSY.

Item # Part # Qty Description16 47351 1 DECAL, COMPOSITE WARNING17 47352 2 DECAL, LIFT POINT18 56595 1 PRESSURE SPEC STICKER - 300

PSI19 59061 1 SIDEPLATE WELDMENT LH20 59062 1 SIDEPLATE WELDMENT RH21 66218 1 GUARANTEED SOUND POWER

LEVEL22 66764 1 DECAL, USA ORIGIN 3"23 72074 1 DECAL, GREASE24 73004 2 DECAL, MB25625 74705 2 DECAL, "STANLEY" 11 INCH26 74720 1 DECAL, CE MB2560027 371052 4 WASHER 3/4" I.D.28 27281 1 CONICAL TOOL BIT


Item MB256 Qty Description1 65918 1 Hose Assy2 65918 1 Hose Assy3 28400 2 Boom Pin4 372089 4 Lynch Pin5 371053 4 Washer6 32387 1 Adapter Weldment Bracket7 380522 1 Hose Clamp8 34839 2 Washer9 34837 1 Capscrew10 371516 1 Nut11 380526 1 Grommet

Item MB256 Qty Description12 02773 4 Adapter13 74723 1 CE Plate

14 74707 1 STANLEY Decal (not pic-tured)

15 28393 4 Side Plate Bushing (see note at top of page)

16 40092 1 Coupler, Male -Not pictured

17 65811 1 Coupler, Female -- Not pictured

MB25600SS MODEL MOUNTING BRACKETS

NOTE: The MB25600SS Model comes with 2 additional adapt-ers P/N-02773 and one male coupler P/N-40092 & one fe-male coupler P/N-65811 that are not pictured here.

NOTE: If you are trying to convert an MB25600 to use on a skid steer bracket you will need to order item # 15 side plate bushings, these bushings require a press fit.

15


MB25641 PARTS LIST & ILLUSTRATION

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ITEM # PART # QTY DESCRIPTION2 11016 2 ADAPTER 10-12 F50X-S8 28393 4 SIDEPLATE BUSHING9 28400 2 BOOM PIN13 40092 1 COUPLER F.F. MALE18 65811 1 COUPLER F.F. FEMALE21 69520 1 Q-TACH MTG BRKT24 69525 1 HOSE 451TC 06 06 12 10 10-47" W/SL25 69525_ 1 HOSE 451TC 06 06 12 10 10-47" W/SL31 371053 4 WASHER 1 3/4" I.D.32 372089 4 LYNCH PIN

STANLEY Infrastructure6430 SE Lake Road

Portland, Oregon 97222 USA(503) 659-5660 / Fax (503) 652-1780

www.stanleyinfrastructure.com

mb256 mounted hydraulic breaker

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